>>> SCREEN 2: "Set the color theme", with a clickable list containing the 
>>> (currently) 16 built-in themes.  A short code snippet above that list 
>>> illustrates how code is displayed with each of these themes.
>>
>> The snippet will only be able to show the buffer text appearance.  For 
>> other UI elements you will need an image.  Would using an image be 
>> better here?
>
> This probably wouldn¢t work on terminal Emacs.  For a more univarsally 
> apllicable, you could have a single snippet, and picking a theme just 
> sets it globally.  A confirm button at bottom saves the preference using 
> customize and advances.
>

Indeed I admit I did not think about terminal Emacs.  The guided tour 
should probably also be skipped if Emacs is executed in a terminal.

>>> You can use M-x initial-greeting at any time to go through this 
>>> configuration again.
>>
>> That command should be on the Help menu.  And I think the name should 
>> be 'introduction-to-emacs' or somesuch.
>
> AFAIU it¢s customary in the industry these days to call these 
> walkthrough wizards "Guided Tours".  That might be a more recognisable 
> name.  ¡initial-greeting¢ and ¡introduction-to-emacs¢ sound rather 
> non-interactive to me, i.e. I¢d expect to be reading stuff, deducing 
> from the names.
>

I think I would also prefer guided-tour, but OTOH that name is not very 
important if it is executed automatically when Emacs starts.